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fixup! introduce externally extensible systems (#93)

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re-expose defaultSystems even if it doesn't make a lot of sense anymore,
to not break back-compat.
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zimbatm 2023-04-09 12:36:57 +02:00
parent 1c226cc8c6
commit 471aed544a
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2 changed files with 16 additions and 18 deletions
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11
README.md
View file

@ -1,7 +1,5 @@
# flake-utils
[![Support room on Matrix](https://img.shields.io/matrix/flake-utils:numtide.com.svg?label=%23flake-utils%3Anumtide.com&logo=matrix&server_fqdn=matrix.numtide.com)](https://matrix.to/#/#flake-utils:numtide.com)
**STATUS: stable**
Pure Nix flake utility functions.
@ -32,14 +30,11 @@ Eg: instead of typing `"x86_64-linux"`, use `system.x86_64-linux`.
A list of all systems defined in nixpkgs. For a smaller list see `defaultSystems`.
### `defaultSystems :: [<system>]`
### `defaultSystems :: [<system>]` (deprecated)
The list of systems supported by nixpkgs and built by hydra.
Useful if you want add additional platforms:
The list of systems passed to the flake-utils `systems` input.
```nix
eachSystem (defaultSystems ++ [system.armv7l-linux]) (system: { hello = 42; })
```
Use this pattern to pass different systems to your flake: <https://github.com/nix-systems/nix-systems>.
### `eachSystem :: [<system>] -> (<system> -> attrs)`

23
lib.nix
View file

@ -8,6 +8,8 @@
]
}:
let
inherit defaultSystems;
# List of all systems defined in nixpkgs
# Keep in sync with nixpkgs wit the following command:
# $ nix-instantiate --json --eval --expr "with import <nixpkgs> {}; lib.platforms.all" | jq 'sort' | sed 's!,!!'
@ -119,8 +121,8 @@ let
builtins.mapAttrs
(name: value:
if ! (builtins.isAttrs value) then value
else if isDerivation value then (merged.${name} or {}) // { ${system} = value; }
else pushDownSystem system (merged.${name} or {}) value);
else if isDerivation value then (merged.${name} or { }) // { ${system} = value; }
else pushDownSystem system (merged.${name} or { }) value);
# Merge together the outputs for all systems.
op = attrs: system:
@ -130,13 +132,14 @@ let
let
appendSystem = key: system: ret:
if key == "hydraJobs"
then (pushDownSystem system (attrs.hydraJobs or {}) ret.hydraJobs)
else { ${system} = ret.${key}; };
in attrs //
{
${key} = (attrs.${key} or { })
// (appendSystem key system ret);
}
then (pushDownSystem system (attrs.hydraJobs or { }) ret.hydraJobs)
else { ${system} = ret.${key}; };
in
attrs //
{
${key} = (attrs.${key} or { })
// (appendSystem key system ret);
}
;
in
builtins.foldl' op attrs (builtins.attrNames ret);
@ -146,7 +149,7 @@ let
# eachSystemMap using defaultSystems
eachDefaultSystemMap = eachSystemMap defaultSystems;
# Builds a map from <attr>=value to <system>.<attr> = value.
eachSystemMap = systems: f: builtins.listToAttrs (builtins.map (system: { name = system; value = f system; }) systems);